Is this the one you have?
If so, it might be the plastic non-slip mat that is off gassing. Idk, it may just take longer to air out or to stop off gassing! You might contact the manufacture an express your concerns! I'm sorry I can't be of much help.
Did you set up the bator and run it, making adjustments for temp and humidity or did you just start it up and put the eggs in as soon as it came up to temp?